Which renowned architectural firm underwent a controversial rebranding in 2011, replacing their 42-year-old logo with a minimalist wordmark that sparked debate throughout the industry?

The visual identity of architectural firms has evolved dramatically over the decades, reflecting changing design philosophies and market positioning. Major architectural practices have undergone significant rebranding efforts that mirror their evolving design approaches. This trivia question explores how one iconic firm's logo transformation represented a pivotal moment in architectural branding history.

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Pentagram (replacing a geometric symbol with a simple text-based logo)
SOM (Skidmore, Owings & Merrill) (abandoning their iconic black box logo)
Foster + Partners (shifting from a stylized 'F' to a wordmark)
Gensler (moving from their distinctive 'G' symbol to a clean text-only design)